.mid-top{
    background-color: #d9d5d5;
    width: 1260px;
    height: 40px;
    padding: 10px 330px;
}
.mid-top>div:nth-child(2)>div{
    padding: 20px 80px;
}
.mid-top>div:nth-child(2)>div:hover{
    cursor: pointer;
    color: white;
    background-color: #00bb00;
}
.mid>div:nth-child(3)>div{
    background-image: url("../img/77.jpg");
    width: 951.5px;
    height: 477.5px;
}
.online {
    /*border: 1px solid red;*/
    width: 500px;
}
input {
    width: 500px;
    height: 30px;
    background-color: rgb(238, 238, 238);
    border: 1px solid gray;
    padding: 0 10px;
}
textarea {
    width: 500px;
    background-color: rgb(238, 238, 238);
    border: 1px dashed gray;
    padding: 10px;
    height: 100px;
    /*只能纵向拖动*/
    resize: vertical;
    /*最小高度*/
    min-height: 100px;
}
input[type=submit] {
    margin: 30px 0 ;
    /*padding: 10px 30px;*/
    width: 530px;
    height: 32px;
    line-height: 30px;
    background-color: black;
    color: white;
}